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perf: avoid double checking value0 Future. #10972

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perf: avoid double checking value0 Future. #10972

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321ae07
perf: avoid double checking `value0` Future.
He-Pin Jan 2, 2025
0ca9173
Update src/library/scala/concurrent/package.scala
He-Pin Sep 5, 2025
a86956d
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He-Pin Sep 5, 2025
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13 changes: 9 additions & 4 deletions project/MimaFilters.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ object MimaFilters extends AutoPlugin {
object autoImport {
val mimaReferenceVersion = settingKey[Option[String]]("Scala version number to run MiMa against")
}

import autoImport._

override val globalSettings = Seq(
Expand Down Expand Up @@ -43,6 +44,10 @@ object MimaFilters extends AutoPlugin {
ProblemFilters.exclude[MissingClassProblem]("scala.collection.generic.CommonErrors"),
ProblemFilters.exclude[MissingClassProblem]("scala.collection.generic.CommonErrors$"),

//ADD: Await#CompletedFuture is not a public API
ProblemFilters.exclude[MissingClassProblem]("scala.concurrent.Await$CompletedFuture$"),
ProblemFilters.exclude[MissingClassProblem]("scala.collection.generic.CommonErrors$"),

// scala/scala#10937
ProblemFilters.exclude[IncompatibleResultTypeProblem]("scala.collection.immutable.LazyList#LazyBuilder#DeferredState.eval"),
ProblemFilters.exclude[MissingClassProblem](s"scala.collection.immutable.LazyList$$State"),
Expand Down Expand Up @@ -82,9 +87,9 @@ object MimaFilters extends AutoPlugin {
)

val mimaSettings: Seq[Setting[_]] = Def.settings(
mimaPreviousArtifacts := mimaReferenceVersion.value.map(organization.value % name.value % _).toSet,
mimaCheckDirection := "both",
mimaBinaryIssueFilters ++= mimaFilters,
// mimaReportSignatureProblems := true, // TODO: enable
mimaPreviousArtifacts := mimaReferenceVersion.value.map(organization.value % name.value % _).toSet,
mimaCheckDirection := "both",
mimaBinaryIssueFilters ++= mimaFilters,
// mimaReportSignatureProblems := true, // TODO: enable
)
}
11 changes: 9 additions & 2 deletions src/library/scala/concurrent/package.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,9 @@ package object concurrent {
}

package concurrent {

import scala.util.Try

/**
* This marker trait is used by [[Await]] to ensure that [[Awaitable.ready]] and [[Awaitable.result]]
* are not directly called by user code. An implicit instance of this trait is only available when
Expand Down Expand Up @@ -170,7 +173,7 @@ package concurrent {
@throws(classOf[TimeoutException])
@throws(classOf[InterruptedException])
final def ready[T](awaitable: Awaitable[T], atMost: Duration): awaitable.type = awaitable match {
case f: Future[T] if f.isCompleted => awaitable.ready(atMost)(AwaitPermission)
case f: Future[T] if f.isCompleted => awaitable
case _ => blocking(awaitable.ready(atMost)(AwaitPermission))
}

Expand All @@ -197,8 +200,12 @@ package concurrent {
@throws(classOf[TimeoutException])
@throws(classOf[InterruptedException])
final def result[T](awaitable: Awaitable[T], atMost: Duration): T = awaitable match {
case f: Future[T] if f.isCompleted => f.result(atMost)(AwaitPermission)
case CompletedFuture(result) => result.get.asInstanceOf[T]
case _ => blocking(awaitable.result(atMost)(AwaitPermission))
}

private[this] object CompletedFuture {
def unapply[T](f: Future[T]): Option[Try[T]] = f.value
}
}
}